High-Performance Non-enzymatic Glucose Sensors Based on CoNiCu Alloy Nanotubes Arrays Prepared by Electrodeposition

Abstract

Transition metal alloys are good candidate electrodes for non-enzymatic glucose sensors due to their low cost and high performance. In this work, we reported the controllable electrodeposition of CoNiCu alloy nanotubes electrodes using anodic aluminum oxide (AAO) as template. Uniform CoNiCu alloy arrays of nanotubes about 2 µm in length and 280 nm in diameter were obtained by optimizing the electrodeposition parameters. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) measurements indicated that the as-prepared alloy nanotubes arrays are composed of 64.7 wt% Co-19.4 wt% Ni-15.9 wt% Cu. Non-enzymatic glucose sensing measurements indicated that the CoNiCu nanotubes arrays possessed a low detection limit of 0.5 µM, a high sensitivity of 791 µA mM −1 cm −2 from 50 to 1,551 µM and 322 µA mM −1 cm −2 from 1,551 to 4,050 µM. Besides, they showed high reliability with the capacity of anti-jamming. Tafel plots showed that alloying brought higher exchange current density and faster reaction speed. The high performance should be due to the synergistic effect of Co, Ni, and Cu metal elements and high surface area of nanotubes arrays.

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

“…Thus, the reversible conversion of Ni 2+ /Ni 3+ and Co 2+ /Co 3+ in NCOs enables repetitive glucose detection [44][45][46]. The selectivity of NCOs is also an important factor for accurate glucose detection: current response to other reagents can detract from the determination of glucose [47][48][49]. The selectivity of the NCOs depending on different pH was investigated as shown in Figure 5.…”

“…The selectivity of NCOs is also an important factor for accurate glucose detection: current response to other reagents can detract from the determination of glucose [ 47 , 48 , 49 ]. The selectivity of the NCOs depending on different pH was investigated as shown in Figure 5 .…”

Recent Advances in Non-Enzymatic Glucose Sensors Based on Metal and Metal Oxide Nanostructures for Diabetes Management- A Review

“…However, the domination of readily oxidizable β-glucopyranoses occurs at greater pH due to mutarotation (Cheng et al, 2001;Sun et al, 2021)- (Cheng et al, 2001;Sun et al, 2021). The application of cobalt and its oxides in sensor technology has significant advantages that include large bandgap, biological compatibility, low cost, and high stability (Soomro et al, 2015;Gong et al, 2019). Owing to its good selectivity and reproducibility, various studies have used cobalt and its oxides to develop NEG sensors in recent years (Soomro et al, 2015;Tian et al, 2018;Janyasupab and Promptmas, 2019;Li et al, 2019;Strakosas et al, 2019;Wang et al, 2019;Zhao et al, 2020).…”

Electrocatalytic Oxidation of Glucose on Boron and Nitrogen Codoped Graphene Quantum Dot Electrodes in Alkali Media

“…The lower Tafel slope of B-N-codoped GQD catalyst can be attributed to the fact that the B and N dopants enable the desorption of oxygenated intermediate species (e.g., OH (ads) ) as a result of doping the heteroatom within the lattice. Indeed, the localized distribution of the molecular orbitals is vastly affected by the pyridinic N doping at the edges through the introduction of unpaired electrons and subsequently weakening the O−O bonding [71][72][73]. Moreover, since the B atoms incorporated within the carbon atoms possess a relative positive charge due to the lower electro-negativity compared to the C atoms [70], stripping the oxygenated species off the B atoms can easily occur owing to the difference in the electro-negativity between the B and O atoms; thus, favoring the subsequent GOR catalytic cycle.…”